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<div id="projectname">lwIP
&#160;<span id="projectnumber">2.1.2</span>
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<div id="projectbrief">Lightweight IP stack</div>
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<div class="textblock"><code>#include &quot;<a class="el" href="opt_8h.html">lwip/opt.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="stats_8h.html">lwip/stats.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="mem_8h.html">lwip/mem.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="udp_8h.html">lwip/udp.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="ip__addr_8h.html">lwip/ip_addr.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="netif_8h.html">lwip/netif.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="def_8h.html">lwip/def.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="dhcp_8h.html">lwip/dhcp.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="autoip_8h.html">lwip/autoip.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="dns_8h.html">lwip/dns.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="lwip_2etharp_8h.html">lwip/etharp.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="prot_2dhcp_8h.html">lwip/prot/dhcp.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="iana_8h.html">lwip/prot/iana.h</a>&quot;</code><br />
<code>#include &lt;string.h&gt;</code><br />
<code>#include &quot;path/to/my/lwip_hooks.h&quot;</code><br />
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Macros</h2></td></tr>
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<tr class="memitem:a63e9ec4517b80d8576f218d905e31a9b"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#a63e9ec4517b80d8576f218d905e31a9b">DHCP_MAX_MSG_LEN</a>(<a class="el" href="structnetif.html">netif</a>)&#160;&#160;&#160;(<a class="el" href="structnetif.html">netif</a>-&gt;mtu)</td></tr>
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Functions</h2></td></tr>
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<tr class="memitem:a1fc0a94e0b94f13c5d302018f7ecb535"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#a1fc0a94e0b94f13c5d302018f7ecb535">dhcp_arp_reply</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>, const <a class="el" href="ip4__addr_8h.html#a3d3b45daffbc15d65da236e31e621b7e">ip4_addr_t</a> *addr)</td></tr>
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<tr class="memitem:gaf7cd42b9f220446b6a597d3474da6ece"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__dhcp4.html#gaf7cd42b9f220446b6a597d3474da6ece">dhcp_release_and_stop</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr>
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<tr class="memitem:gaf92f7afb58252f82a749064602974bd4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__dhcp4.html#gaf92f7afb58252f82a749064602974bd4">dhcp_release</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr>
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<tr class="memitem:ga93f6bf21086dc9b10c0bec4676f97312"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__dhcp4.html#ga93f6bf21086dc9b10c0bec4676f97312">dhcp_stop</a> (struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr>
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<tr class="memitem:ae24a2529372218327ab9cb6592041c85"><td class="memItemLeft" align="right" valign="top">u8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#ae24a2529372218327ab9cb6592041c85">dhcp_supplied_address</a> (const struct <a class="el" href="structnetif.html">netif</a> *<a class="el" href="structnetif.html">netif</a>)</td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="var-members"></a>
Variables</h2></td></tr>
<tr class="memitem:a5abd232496063bddcbc6692c0e8f9c1f"><td class="memItemLeft" align="right" valign="top">u32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#a5abd232496063bddcbc6692c0e8f9c1f">dhcp_rx_options_val</a> [DHCP_OPTION_IDX_MAX]</td></tr>
<tr class="separator:a5abd232496063bddcbc6692c0e8f9c1f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a058b71e1d26b3758b29d16d9f892c8cc"><td class="memItemLeft" align="right" valign="top">u8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="dhcp_8c.html#a058b71e1d26b3758b29d16d9f892c8cc">dhcp_rx_options_given</a> [DHCP_OPTION_IDX_MAX]</td></tr>
<tr class="separator:a058b71e1d26b3758b29d16d9f892c8cc"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Dynamic Host Configuration Protocol client </p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
<a id="ad6de9c5120654454a330bf5de53c4835"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ad6de9c5120654454a330bf5de53c4835">&#9670;&nbsp;</a></span>DHCP_CREATE_RAND_XID</h2>
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<td class="memname">#define DHCP_CREATE_RAND_XID&#160;&#160;&#160;1</td>
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<p>DHCP_CREATE_RAND_XID: if this is set to 1, the xid is created using <a class="el" href="group__compiler__abstraction.html#ga77370c377781ee7489e30eaf772ea05a">LWIP_RAND()</a> (this overrides DHCP_GLOBAL_XID) </p>
</div>
</div>
<a id="a63e9ec4517b80d8576f218d905e31a9b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a63e9ec4517b80d8576f218d905e31a9b">&#9670;&nbsp;</a></span>DHCP_MAX_MSG_LEN</h2>
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<td class="memname">#define DHCP_MAX_MSG_LEN</td>
<td>(</td>
<td class="paramtype">&#160;</td>
<td class="paramname"><a class="el" href="structnetif.html">netif</a></td><td>)</td>
<td>&#160;&#160;&#160;(<a class="el" href="structnetif.html">netif</a>-&gt;mtu)</td>
</tr>
</table>
</div><div class="memdoc">
<p>Default for DHCP_GLOBAL_XID is 0xABCD0000 This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g. #define DHCP_GLOBAL_XID_HEADER "stdlib.h" #define DHCP_GLOBAL_XID rand() DHCP_OPTION_MAX_MSG_SIZE is set to the MTU MTU is checked to be big enough in dhcp_start </p>
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</div>
<a id="aa52c2b64ef42fbad84a3bcd58052caab"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa52c2b64ef42fbad84a3bcd58052caab">&#9670;&nbsp;</a></span>DHCP_MIN_REPLY_LEN</h2>
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<td class="memname">#define DHCP_MIN_REPLY_LEN&#160;&#160;&#160;44</td>
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<p>Minimum length for reply before packet is parsed </p>
</div>
</div>
<h2 class="groupheader">Enumeration Type Documentation</h2>
<a id="a8c3b584d223b995b48613ad96cb776a0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a8c3b584d223b995b48613ad96cb776a0">&#9670;&nbsp;</a></span>dhcp_option_idx</h2>
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<td class="memname">enum <a class="el" href="dhcp_8c.html#a8c3b584d223b995b48613ad96cb776a0">dhcp_option_idx</a></td>
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</table>
</div><div class="memdoc">
<p>Option handling: options are parsed in dhcp_parse_reply and saved in an array where other functions can load them from. This might be moved into the struct dhcp (not necessarily since lwIP is single-threaded and the array is only used while in recv callback). </p>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="a1fc0a94e0b94f13c5d302018f7ecb535"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a1fc0a94e0b94f13c5d302018f7ecb535">&#9670;&nbsp;</a></span>dhcp_arp_reply()</h2>
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<td class="memname">void dhcp_arp_reply </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structnetif.html">netif</a> *&#160;</td>
<td class="paramname"><em>netif</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="ip4__addr_8h.html#a3d3b45daffbc15d65da236e31e621b7e">ip4_addr_t</a> *&#160;</td>
<td class="paramname"><em>addr</em>&#160;</td>
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<td></td>
<td>)</td>
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<p>Match an ARP reply with the offered IP address: check whether the offered IP address is not in use using ARP</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">netif</td><td>the network interface on which the reply was received </td></tr>
<tr><td class="paramname">addr</td><td>The IP address we received a reply from </td></tr>
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</dd>
</dl>
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<a id="ad7480883d64f3d6f083c8aa933b5e3cb"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ad7480883d64f3d6f083c8aa933b5e3cb">&#9670;&nbsp;</a></span>dhcp_coarse_tmr()</h2>
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<td class="memname">void dhcp_coarse_tmr </td>
<td>(</td>
<td class="paramtype">void&#160;</td>
<td class="paramname"></td><td>)</td>
<td></td>
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<p>The DHCP timer that checks for lease renewal/rebind timeouts. Must be called once a minute (see <a class="el" href="dhcp_8h.html#a3751cc5daa0875d415ebacd8ad675f1e">DHCP_COARSE_TIMER_SECS</a>). </p>
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<a id="a601d97faa24fa7289244bb452f052045"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a601d97faa24fa7289244bb452f052045">&#9670;&nbsp;</a></span>dhcp_fine_tmr()</h2>
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<td class="memname">void dhcp_fine_tmr </td>
<td>(</td>
<td class="paramtype">void&#160;</td>
<td class="paramname"></td><td>)</td>
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<p>DHCP transaction timeout handling (this function must be called every 500ms, see <a class="el" href="dhcp_8h.html#a7a26209f52eebe8ded457ae141df403f">DHCP_FINE_TIMER_MSECS</a>).</p>
<p>A DHCP server is expected to respond within a short period of time. This timer checks whether an outstanding DHCP request is timed out. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a04f3824720223c439165243527906002">&#9670;&nbsp;</a></span>dhcp_network_changed()</h2>
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<td class="memname">void dhcp_network_changed </td>
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<td class="paramtype">struct <a class="el" href="structnetif.html">netif</a> *&#160;</td>
<td class="paramname"><em>netif</em></td><td>)</td>
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<p>Handle a possible change in the network configuration.</p>
<p>This enters the REBOOTING state to verify that the currently bound address is still valid. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ae24a2529372218327ab9cb6592041c85">&#9670;&nbsp;</a></span>dhcp_supplied_address()</h2>
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<td class="memname">u8_t dhcp_supplied_address </td>
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<td class="paramtype">const struct <a class="el" href="structnetif.html">netif</a> *&#160;</td>
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<p>check if DHCP supplied netif-&gt;<a class="el" href="structip__addr.html">ip_addr</a></p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">netif</td><td>the netif to check </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>1 if DHCP supplied netif-&gt;<a class="el" href="structip__addr.html">ip_addr</a> (states BOUND or RENEWING), 0 otherwise </dd></dl>
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<h2 class="groupheader">Variable Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a058b71e1d26b3758b29d16d9f892c8cc">&#9670;&nbsp;</a></span>dhcp_rx_options_given</h2>
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<td class="memname">u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX]</td>
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<p>Holds a flag which option was received and is contained in dhcp_rx_options_val, only valid while in dhcp_recv. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a5abd232496063bddcbc6692c0e8f9c1f">&#9670;&nbsp;</a></span>dhcp_rx_options_val</h2>
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<td class="memname">u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX]</td>
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<p>Holds the decoded option values, only valid while in dhcp_recv. </p>
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